532 lines
19 KiB
C
532 lines
19 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "errno-util.h"
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#include "format-util.h"
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#include "libcrypt-util.h"
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#include "strv.h"
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#include "user-record-nss.h"
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#include "user-util.h"
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#include "utf8.h"
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#define SET_IF(field, condition, value, fallback) \
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field = (condition) ? (value) : (fallback)
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static inline const char* utf8_only(const char *s) {
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return s && utf8_is_valid(s) ? s : NULL;
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}
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static inline int strv_extend_strv_utf8_only(char ***dst, char **src, bool filter_duplicates) {
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_cleanup_free_ char **t = NULL;
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size_t l, j = 0;
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/* First, do a shallow copy of s, filtering for only valid utf-8 strings */
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l = strv_length(src);
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t = new(char*, l + 1);
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if (!t)
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return -ENOMEM;
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for (size_t i = 0; i < l; i++)
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if (utf8_is_valid(src[i]))
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t[j++] = src[i];
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if (j == 0)
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return 0;
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t[j] = NULL;
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return strv_extend_strv(dst, t, filter_duplicates);
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}
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int nss_passwd_to_user_record(
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const struct passwd *pwd,
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const struct spwd *spwd,
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UserRecord **ret) {
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_cleanup_(user_record_unrefp) UserRecord *hr = NULL;
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int r;
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assert(pwd);
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assert(ret);
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if (isempty(pwd->pw_name))
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return -EINVAL;
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if (spwd && !streq_ptr(spwd->sp_namp, pwd->pw_name))
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return -EINVAL;
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hr = user_record_new();
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if (!hr)
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return -ENOMEM;
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r = free_and_strdup(&hr->user_name, pwd->pw_name);
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if (r < 0)
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return r;
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/* Some bad NSS modules synthesize GECOS fields with embedded ":" or "\n" characters, which are not
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* something we can output in /etc/passwd compatible format, since these are record separators
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* there. We normally refuse that, but we need to maintain compatibility with arbitrary NSS modules,
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* hence let's do what glibc does: mangle the data to fit the format. */
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if (isempty(pwd->pw_gecos) || streq_ptr(pwd->pw_gecos, hr->user_name))
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hr->real_name = mfree(hr->real_name);
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else if (valid_gecos(pwd->pw_gecos)) {
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r = free_and_strdup(&hr->real_name, pwd->pw_gecos);
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if (r < 0)
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return r;
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} else {
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_cleanup_free_ char *mangled = NULL;
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mangled = mangle_gecos(pwd->pw_gecos);
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if (!mangled)
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return -ENOMEM;
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free_and_replace(hr->real_name, mangled);
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}
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r = free_and_strdup(&hr->home_directory, utf8_only(empty_to_null(pwd->pw_dir)));
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if (r < 0)
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return r;
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r = free_and_strdup(&hr->shell, utf8_only(empty_to_null(pwd->pw_shell)));
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if (r < 0)
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return r;
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hr->uid = pwd->pw_uid;
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hr->gid = pwd->pw_gid;
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if (spwd &&
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looks_like_hashed_password(utf8_only(spwd->sp_pwdp))) { /* Ignore locked, disabled, and mojibake passwords */
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strv_free_erase(hr->hashed_password);
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hr->hashed_password = strv_new(spwd->sp_pwdp);
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if (!hr->hashed_password)
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return -ENOMEM;
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} else
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hr->hashed_password = strv_free_erase(hr->hashed_password);
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/* shadow-utils suggests using "chage -E 0" (or -E 1, depending on which man page you check)
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* for locking a whole account, hence check for that. Note that it also defines a way to lock
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* just a password instead of the whole account, but that's mostly pointless in times of
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* password-less authorization, hence let's not bother. */
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SET_IF(hr->locked,
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spwd && spwd->sp_expire >= 0,
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spwd->sp_expire <= 1, -1);
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SET_IF(hr->not_after_usec,
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spwd && spwd->sp_expire > 1 && (uint64_t) spwd->sp_expire < (UINT64_MAX-1)/USEC_PER_DAY,
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spwd->sp_expire * USEC_PER_DAY, UINT64_MAX);
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SET_IF(hr->password_change_now,
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spwd && spwd->sp_lstchg >= 0,
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spwd->sp_lstchg == 0, -1);
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SET_IF(hr->last_password_change_usec,
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spwd && spwd->sp_lstchg > 0 && (uint64_t) spwd->sp_lstchg <= (UINT64_MAX-1)/USEC_PER_DAY,
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spwd->sp_lstchg * USEC_PER_DAY, UINT64_MAX);
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SET_IF(hr->password_change_min_usec,
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spwd && spwd->sp_min > 0 && (uint64_t) spwd->sp_min <= (UINT64_MAX-1)/USEC_PER_DAY,
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spwd->sp_min * USEC_PER_DAY, UINT64_MAX);
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SET_IF(hr->password_change_max_usec,
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spwd && spwd->sp_max > 0 && (uint64_t) spwd->sp_max <= (UINT64_MAX-1)/USEC_PER_DAY,
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spwd->sp_max * USEC_PER_DAY, UINT64_MAX);
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SET_IF(hr->password_change_warn_usec,
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spwd && spwd->sp_warn > 0 && (uint64_t) spwd->sp_warn <= (UINT64_MAX-1)/USEC_PER_DAY,
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spwd->sp_warn * USEC_PER_DAY, UINT64_MAX);
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SET_IF(hr->password_change_inactive_usec,
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spwd && spwd->sp_inact > 0 && (uint64_t) spwd->sp_inact <= (UINT64_MAX-1)/USEC_PER_DAY,
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spwd->sp_inact * USEC_PER_DAY, UINT64_MAX);
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hr->json = json_variant_unref(hr->json);
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r = json_build(&hr->json, JSON_BUILD_OBJECT(
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JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(hr->user_name)),
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JSON_BUILD_PAIR("uid", JSON_BUILD_UNSIGNED(hr->uid)),
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JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(hr->gid)),
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JSON_BUILD_PAIR_CONDITION(hr->real_name, "realName", JSON_BUILD_STRING(hr->real_name)),
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JSON_BUILD_PAIR_CONDITION(hr->home_directory, "homeDirectory", JSON_BUILD_STRING(hr->home_directory)),
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JSON_BUILD_PAIR_CONDITION(hr->shell, "shell", JSON_BUILD_STRING(hr->shell)),
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JSON_BUILD_PAIR_CONDITION(!strv_isempty(hr->hashed_password), "privileged", JSON_BUILD_OBJECT(JSON_BUILD_PAIR("hashedPassword", JSON_BUILD_STRV(hr->hashed_password)))),
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JSON_BUILD_PAIR_CONDITION(hr->locked >= 0, "locked", JSON_BUILD_BOOLEAN(hr->locked)),
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JSON_BUILD_PAIR_CONDITION(hr->not_after_usec != UINT64_MAX, "notAfterUSec", JSON_BUILD_UNSIGNED(hr->not_after_usec)),
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JSON_BUILD_PAIR_CONDITION(hr->password_change_now >= 0, "passwordChangeNow", JSON_BUILD_BOOLEAN(hr->password_change_now)),
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JSON_BUILD_PAIR_CONDITION(hr->last_password_change_usec != UINT64_MAX, "lastPasswordChangeUSec", JSON_BUILD_UNSIGNED(hr->last_password_change_usec)),
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JSON_BUILD_PAIR_CONDITION(hr->password_change_min_usec != UINT64_MAX, "passwordChangeMinUSec", JSON_BUILD_UNSIGNED(hr->password_change_min_usec)),
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JSON_BUILD_PAIR_CONDITION(hr->password_change_max_usec != UINT64_MAX, "passwordChangeMaxUSec", JSON_BUILD_UNSIGNED(hr->password_change_max_usec)),
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JSON_BUILD_PAIR_CONDITION(hr->password_change_warn_usec != UINT64_MAX, "passwordChangeWarnUSec", JSON_BUILD_UNSIGNED(hr->password_change_warn_usec)),
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JSON_BUILD_PAIR_CONDITION(hr->password_change_inactive_usec != UINT64_MAX, "passwordChangeInactiveUSec", JSON_BUILD_UNSIGNED(hr->password_change_inactive_usec))));
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if (r < 0)
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return r;
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hr->mask = USER_RECORD_REGULAR |
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(!strv_isempty(hr->hashed_password) ? USER_RECORD_PRIVILEGED : 0);
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*ret = TAKE_PTR(hr);
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return 0;
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}
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int nss_spwd_for_passwd(const struct passwd *pwd, struct spwd *ret_spwd, char **ret_buffer) {
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size_t buflen = 4096;
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int r;
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assert(pwd);
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assert(ret_spwd);
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assert(ret_buffer);
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for (;;) {
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_cleanup_free_ char *buf = NULL;
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struct spwd spwd, *result;
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buf = malloc(buflen);
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if (!buf)
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return -ENOMEM;
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r = getspnam_r(pwd->pw_name, &spwd, buf, buflen, &result);
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if (r == 0) {
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if (!result)
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return -ESRCH;
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*ret_spwd = *result;
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*ret_buffer = TAKE_PTR(buf);
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return 0;
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}
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if (r < 0)
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return -EIO; /* Weird, this should not return negative! */
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if (r != ERANGE)
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return -r;
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if (buflen > SIZE_MAX / 2)
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return -ERANGE;
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buflen *= 2;
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buf = mfree(buf);
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}
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}
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int nss_user_record_by_name(
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const char *name,
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bool with_shadow,
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UserRecord **ret) {
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_cleanup_free_ char *buf = NULL, *sbuf = NULL;
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struct passwd pwd, *result;
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bool incomplete = false;
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size_t buflen = 4096;
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struct spwd spwd, *sresult = NULL;
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int r;
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assert(name);
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assert(ret);
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for (;;) {
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buf = malloc(buflen);
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if (!buf)
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return -ENOMEM;
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r = getpwnam_r(name, &pwd, buf, buflen, &result);
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if (r == 0) {
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if (!result)
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return -ESRCH;
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break;
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}
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if (r < 0)
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return log_debug_errno(SYNTHETIC_ERRNO(EIO), "getpwnam_r() returned a negative value");
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if (r != ERANGE)
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return -r;
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if (buflen > SIZE_MAX / 2)
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return -ERANGE;
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buflen *= 2;
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buf = mfree(buf);
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}
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if (with_shadow) {
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r = nss_spwd_for_passwd(result, &spwd, &sbuf);
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if (r < 0) {
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log_debug_errno(r, "Failed to do shadow lookup for user %s, ignoring: %m", name);
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incomplete = ERRNO_IS_PRIVILEGE(r);
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} else
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sresult = &spwd;
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} else
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incomplete = true;
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r = nss_passwd_to_user_record(result, sresult, ret);
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if (r < 0)
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return r;
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(*ret)->incomplete = incomplete;
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return 0;
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}
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int nss_user_record_by_uid(
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uid_t uid,
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bool with_shadow,
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UserRecord **ret) {
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_cleanup_free_ char *buf = NULL, *sbuf = NULL;
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struct passwd pwd, *result;
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bool incomplete = false;
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size_t buflen = 4096;
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struct spwd spwd, *sresult = NULL;
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int r;
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assert(ret);
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for (;;) {
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buf = malloc(buflen);
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if (!buf)
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return -ENOMEM;
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r = getpwuid_r(uid, &pwd, buf, buflen, &result);
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if (r == 0) {
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if (!result)
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return -ESRCH;
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break;
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}
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if (r < 0)
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return log_debug_errno(SYNTHETIC_ERRNO(EIO), "getpwuid_r() returned a negative value");
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if (r != ERANGE)
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return -r;
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if (buflen > SIZE_MAX / 2)
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return -ERANGE;
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buflen *= 2;
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buf = mfree(buf);
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}
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if (with_shadow) {
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r = nss_spwd_for_passwd(result, &spwd, &sbuf);
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if (r < 0) {
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log_debug_errno(r, "Failed to do shadow lookup for UID " UID_FMT ", ignoring: %m", uid);
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incomplete = ERRNO_IS_PRIVILEGE(r);
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} else
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sresult = &spwd;
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} else
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incomplete = true;
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r = nss_passwd_to_user_record(result, sresult, ret);
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if (r < 0)
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return r;
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(*ret)->incomplete = incomplete;
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return 0;
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}
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int nss_group_to_group_record(
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const struct group *grp,
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const struct sgrp *sgrp,
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GroupRecord **ret) {
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_cleanup_(group_record_unrefp) GroupRecord *g = NULL;
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int r;
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assert(grp);
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assert(ret);
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if (isempty(grp->gr_name))
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return -EINVAL;
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if (sgrp && !streq_ptr(sgrp->sg_namp, grp->gr_name))
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return -EINVAL;
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g = group_record_new();
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if (!g)
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return -ENOMEM;
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g->group_name = strdup(grp->gr_name);
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if (!g->group_name)
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return -ENOMEM;
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r = strv_extend_strv_utf8_only(&g->members, grp->gr_mem, false);
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if (r < 0)
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return r;
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g->gid = grp->gr_gid;
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if (sgrp) {
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if (looks_like_hashed_password(utf8_only(sgrp->sg_passwd))) {
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g->hashed_password = strv_new(sgrp->sg_passwd);
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if (!g->hashed_password)
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return -ENOMEM;
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}
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r = strv_extend_strv_utf8_only(&g->members, sgrp->sg_mem, true);
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if (r < 0)
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return r;
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r = strv_extend_strv_utf8_only(&g->administrators, sgrp->sg_adm, false);
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if (r < 0)
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return r;
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}
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r = json_build(&g->json, JSON_BUILD_OBJECT(
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JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(g->group_name)),
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JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(g->gid)),
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JSON_BUILD_PAIR_CONDITION(!strv_isempty(g->members), "members", JSON_BUILD_STRV(g->members)),
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JSON_BUILD_PAIR_CONDITION(!strv_isempty(g->hashed_password), "privileged", JSON_BUILD_OBJECT(JSON_BUILD_PAIR("hashedPassword", JSON_BUILD_STRV(g->hashed_password)))),
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JSON_BUILD_PAIR_CONDITION(!strv_isempty(g->administrators), "administrators", JSON_BUILD_STRV(g->administrators))));
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if (r < 0)
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return r;
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g->mask = USER_RECORD_REGULAR |
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(!strv_isempty(g->hashed_password) ? USER_RECORD_PRIVILEGED : 0);
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*ret = TAKE_PTR(g);
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return 0;
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}
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int nss_sgrp_for_group(const struct group *grp, struct sgrp *ret_sgrp, char **ret_buffer) {
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size_t buflen = 4096;
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int r;
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assert(grp);
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assert(ret_sgrp);
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assert(ret_buffer);
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for (;;) {
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_cleanup_free_ char *buf = NULL;
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struct sgrp sgrp, *result;
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buf = malloc(buflen);
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if (!buf)
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return -ENOMEM;
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r = getsgnam_r(grp->gr_name, &sgrp, buf, buflen, &result);
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if (r == 0) {
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if (!result)
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return -ESRCH;
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*ret_sgrp = *result;
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*ret_buffer = TAKE_PTR(buf);
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return 0;
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}
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if (r < 0)
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return -EIO; /* Weird, this should not return negative! */
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if (r != ERANGE)
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return -r;
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if (buflen > SIZE_MAX / 2)
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return -ERANGE;
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buflen *= 2;
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buf = mfree(buf);
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}
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}
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int nss_group_record_by_name(
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const char *name,
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bool with_shadow,
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GroupRecord **ret) {
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_cleanup_free_ char *buf = NULL, *sbuf = NULL;
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struct group grp, *result;
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bool incomplete = false;
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size_t buflen = 4096;
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struct sgrp sgrp, *sresult = NULL;
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int r;
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assert(name);
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assert(ret);
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for (;;) {
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buf = malloc(buflen);
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if (!buf)
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return -ENOMEM;
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r = getgrnam_r(name, &grp, buf, buflen, &result);
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if (r == 0) {
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if (!result)
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return -ESRCH;
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break;
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}
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if (r < 0)
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return log_debug_errno(SYNTHETIC_ERRNO(EIO), "getgrnam_r() returned a negative value");
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if (r != ERANGE)
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return -r;
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if (buflen > SIZE_MAX / 2)
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return -ERANGE;
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buflen *= 2;
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buf = mfree(buf);
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}
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if (with_shadow) {
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r = nss_sgrp_for_group(result, &sgrp, &sbuf);
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if (r < 0) {
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log_debug_errno(r, "Failed to do shadow lookup for group %s, ignoring: %m", result->gr_name);
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incomplete = ERRNO_IS_PRIVILEGE(r);
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} else
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sresult = &sgrp;
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} else
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incomplete = true;
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r = nss_group_to_group_record(result, sresult, ret);
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if (r < 0)
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return r;
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(*ret)->incomplete = incomplete;
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return 0;
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}
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int nss_group_record_by_gid(
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gid_t gid,
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bool with_shadow,
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GroupRecord **ret) {
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_cleanup_free_ char *buf = NULL, *sbuf = NULL;
|
|
struct group grp, *result;
|
|
bool incomplete = false;
|
|
size_t buflen = 4096;
|
|
struct sgrp sgrp, *sresult = NULL;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
for (;;) {
|
|
buf = malloc(buflen);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
r = getgrgid_r(gid, &grp, buf, buflen, &result);
|
|
if (r == 0) {
|
|
if (!result)
|
|
return -ESRCH;
|
|
break;
|
|
}
|
|
|
|
if (r < 0)
|
|
return log_debug_errno(SYNTHETIC_ERRNO(EIO), "getgrgid_r() returned a negative value");
|
|
if (r != ERANGE)
|
|
return -r;
|
|
if (buflen > SIZE_MAX / 2)
|
|
return -ERANGE;
|
|
|
|
buflen *= 2;
|
|
buf = mfree(buf);
|
|
}
|
|
|
|
if (with_shadow) {
|
|
r = nss_sgrp_for_group(result, &sgrp, &sbuf);
|
|
if (r < 0) {
|
|
log_debug_errno(r, "Failed to do shadow lookup for group %s, ignoring: %m", result->gr_name);
|
|
incomplete = ERRNO_IS_PRIVILEGE(r);
|
|
} else
|
|
sresult = &sgrp;
|
|
} else
|
|
incomplete = true;
|
|
|
|
r = nss_group_to_group_record(result, sresult, ret);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
(*ret)->incomplete = incomplete;
|
|
return 0;
|
|
}
|